LM8333

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SNLS246K – SEPTEMBER 2006 – REVISED MAY 2013

Figure 7. General-Purpose I/O Control Commands

Table 4 shows the pin configuration for all four combinations of control bit settings (data output and direction) for

the general-purpose I/O pins. GEN_IO_3 cannot be put into the high impedance (Hi-Z) input mode. When

programmed as an input, it can only be configured as an input with a weak pullup.

Table 4. General Purpose I/O Pin Configuration

GEN_IO_DIR Bit

GEN_IO_OUT Bit

Direction

State

0

0

Input

Hi-Z

0

1

Input

Weak Pullup

1

0

Output

Drive Low

1

1

Output

Drive High

External Interrupts

When the GEN_IO_0 or GEN_IO_1 pins are configured as inputs, a SET_EXT_INT command (0xD1) can be

used to enable receiving external interrupts on either or both of these pins. Setting the EX_0 or EX_1 bits in the

data byte of the SET_EXT_INT command (as shown in Figure 8) enables the corresponding pin as an external

interrupt input. When enabled as an interrupt input, any rising or falling edge causes the IRQ output to be

asserted. If the LM8333 was in Halt mode, it also wakes up into Active mode.

Figure 8. SET_EXT_INT Command Data Byte

When both GEN_IO_0 and GEN_IO_1 are configured as interrupt inputs, bits 1 and 2 of the interrupt code

indicate which input asserted the interrupt. However, if only one of GEN_IO_0 or GEN_IO_1 is configured as an

interrupt input, both bits 1 and 2 of the interrupt code will be set when an interrupt occurs.

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